CN115367795B - A new process for producing ammonium sulfate by recycling catalyst titanium dioxide water wash liquid into acid-making tail gas system - Google Patents
A new process for producing ammonium sulfate by recycling catalyst titanium dioxide water wash liquid into acid-making tail gas system Download PDFInfo
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Abstract
本发明属于催化剂钛白粉废水处理技术领域，具体的涉及一种催化剂钛白粉水洗液回用于制酸尾气系统制备硫酸铵的新工艺。所述工艺包括偏钛酸中硫酸的中和以及偏钛酸的水洗；水洗后的滤液再次过滤，回收在水洗过程中穿滤的偏钛酸颗粒，回低温煅烧系统，水洗液废水进入硫酸生产的尾气吸收喷淋系统，所述硫酸生产尾气吸收喷淋系统包括循环水罐及循环水泵；待循环水罐的硫酸铵达到一定的浓度则进入多效浓缩系统，蒸发浓缩硫酸铵溶液得到固体硫酸铵，此系统以蒸汽为热源，蒸发后的冷凝水再回催化剂钛白粉生产用于偏钛酸的打浆。本发明所述的制备硫酸铵的新工艺，对水洗液废水又进行了一次过滤，回收了穿滤的偏钛酸，提高了催化剂钛白粉生产的收率。
The invention belongs to the technical field of catalyst titanium dioxide wastewater treatment, and specifically relates to a new process for recycling the catalyst titanium dioxide water washing liquid into an acid-making tail gas system to prepare ammonium sulfate. The process includes neutralization of sulfuric acid in metatitanic acid and water washing of metatitanic acid; the washed filtrate is filtered again, and the metatitanic acid particles filtered during the water washing process are recovered and returned to the low-temperature calcination system, and the washing liquid wastewater enters the sulfuric acid production The exhaust gas absorption spray system of sulfuric acid production includes a circulating water tank and a circulating water pump; when the ammonium sulfate in the circulating water tank reaches a certain concentration, it enters the multi-effect concentration system, and the ammonium sulfate solution is evaporated and concentrated to obtain solid sulfuric acid. Ammonium, this system uses steam as the heat source, and the condensed water after evaporation is returned to the catalyst for the production of titanium dioxide for the beating of metatitanic acid. The new process for preparing ammonium sulfate of the present invention filters the washing liquid wastewater again, recovers the filtered metatitanic acid, and improves the yield of catalyst titanium dioxide production.
Description
Technical Field
The invention belongs to the technical field of catalyst titanium dioxide wastewater treatment, and particularly relates to a novel process for preparing ammonium sulfate by recycling catalyst titanium dioxide water washing liquid in an acid-making tail gas system.
Background
The amorphous titanium dioxide produced by the sulfuric acid method has been widely used in the catalyst field, especially in the flue gas denitration of power plants and automobile exhaust catalysts, the catalyst has higher requirements on the specific surface area of the titanium dioxide, so that the titanium dioxide cannot be calcined at high temperature during preparation, and if the titanium dioxide is calcined at high temperature, the specific surface area of the titanium dioxide can be greatly reduced, so that the active area of the catalyst is reduced, and only a low-temperature calcination mode can be adopted. The common sulfuric acid method anatase type and rutile type titanium dioxide cannot be completely washed by pure water, partial sulfuric acid is also contained in the metatitanic acid, then the sulfur content in the titanium dioxide is removed by high-temperature calcination, however, the catalyst titanium dioxide cannot be calcined at high temperature, so that the ammonia sulfate can be generated by adding excessive ammonia water into the water washed metatitanic acid slurry for neutralization, and then the ammonia sulfate is removed by water washing, thereby achieving the purpose of reducing the sulfur content, so that a large amount of wastewater containing low-concentration ammonia sulfate (less than 10 g/L) and a small amount of ammonia water is generated, about 4-5 tons of wastewater can be generated when 1 ton of catalyst titanium dioxide is produced, and if the wastewater is directly discharged, the ammonia nitrogen content of a water body exceeds standard, the environment is polluted, and the resource waste is caused.
At present, ammonium sulfate is mainly prepared in a direct evaporation concentration mode in the sulfuric acid method catalyst titanium dioxide production water washing wastewater, because the concentration of ammonium sulfate in the wastewater is low, a large amount of steam is wasted to prepare a small amount of ammonium sulfate, and the wastewater contains a small amount of ammonia water which volatilizes in the evaporation concentration process, so that the ammonia nitrogen content in evaporation condensate water exceeds the standard to cause secondary pollution.
In view of this, there is a need for an improvement in the existing way of treating wastewater from the production of water washing liquid from titanium dioxide as a catalyst in the sulfuric acid process to solve the above-mentioned problems.
Disclosure of Invention
The purpose of the invention is that: providing a new process for preparing ammonium sulfate by recycling the catalyst titanium dioxide water washing liquid to an acid-making tail gas system; the new process meets the requirement of zero wastewater discharge, realizes comprehensive utilization of energy sources, and greatly reduces the energy consumption required by production.
The invention relates to a novel process for preparing ammonium sulfate by recycling catalyst titanium dioxide water washing liquid in an acid-making tail gas system, which comprises the following steps:
(1) Adding excessive ammonia water into the metatitanic acid slurry, regulating the pH value of the system to 10.5-11.5, filtering, and washing the filter cake to obtain washing liquid wastewater and the filter cake;
(2) Filtering the water-washing wastewater obtained in the step (1) again to obtain water-washing filtrate and water-washing filter residues;
(3) Sending the filter cake obtained in the step (1) and the water washing filter residue obtained in the step (2) into a rotary kiln low-temperature calcination system for calcination to obtain catalyst titanium dioxide;
(4) Pumping the water washing filtrate obtained in the step (2) into a circulating water tank through a circulating water pump, adding ammonia water into the circulating water tank, and spraying tail gas generated during sulfuric acid production;
(5) When the concentration of ammonium sulfate in the circulating water tank in the step (4) reaches 260 g/L-290 g/L, pumping the liquid in the circulating water tank into a concentration system for evaporation concentration, and then drying to prepare the ammonium sulfate.
Wherein:
the meta-titanic acid slurry in the step (1) is converted into TiO 2 The content is 280-320 g/L, H 2 SO 4 The content of (C) is 18-22 g/L.
The concentration of the ammonia water in the step (1) is 15% -17%.
The filtering precision of the filtering element adopted in the step (1) is 0.1-0.3 μm.
And (2) filtering in the step (1), and washing a filter cake simultaneously, wherein the filter cake is meta-titanic acid, so as to obtain water-washing liquid wastewater, the water-washing liquid wastewater consists of a filtrate obtained by filtering and a waste liquid obtained by washing the filter cake simultaneously, and the filtrate obtained by filtering is: simultaneously, washing the filter cake with water to obtain waste liquid with the mass ratio of 1:2-3; and (3) washing the meta-titanic acid, wherein 4-5 tons of deionized water is needed to wash the filter cake per 1 ton of catalyst titanium dioxide to remove ammonium sulfate in the filter cake.
The concentration of ammonium sulfate in the wastewater of the water washing liquid in the step (1) is 6-10 g/L, and the concentration of ammonia water is 30-40 mg/L.
Adding excessive ammonia water into a meta-titanic acid slurry tank in the production process of the catalyst titanium dioxide in the step (1) to neutralize sulfuric acid in the meta-titanic acid to generate ammonium sulfate; the reaction equation is shown below:
2NH 3 ·H 2 O+H 2 SO 4 ＝(NH4) 2 SO 4 +2H 2 O。
as shown in figure 1, the meta-titanic acid is required to be filtered, and 4-5 tons of deionized water is required to wash a filter cake per 1 ton of catalyst titanium dioxide to remove ammonium sulfate in the filter cake, and the concentration of the ammonium sulfate in the filtrate is relatively low and is about 6-10 g/L because the water consumption is relatively large, so that the meta-titanic acid is water-washed liquid wastewater generated in the production of the catalyst titanium dioxide.
And (3) filtering the reclaimed water washing wastewater again in the step (2) in a plate-frame filtering mode, wherein the filter cloth is alkali-resistant filter cloth, and the filtering precision of the adopted filtering element is 0.1-0.3 mu m.
The filter residue of the water washing liquid obtained in the step (2) is catalyst titanium dioxide water washing penetrating filtered large particles of meta-titanic acid, the components of the filtrate of the water washing liquid are unchanged to be the same as those of the wastewater of the water washing liquid in the step (1), namely, the concentration of ammonium sulfate is 6-10 g/L, and the concentration of ammonia water is 30-40 mg/L.
The filter cake obtained in the step (1) and the filter residue of the water washing liquid obtained in the step (2) are sent into a rotary kiln low-temperature calcination system for calcination, and the primary ring temperature of the rotary kiln is 130-180 ℃; the temperature of the two rings is 250-350 ℃, the temperature of the three rings is 450-550 ℃, and the time from the feeding of the metatitanic acid into the rotary kiln to the completion of calcination is 6-6.5 hours.
In the step (4), ammonia water (NH) is added into the circulating water tank every 24 hours 3 ·H 2 The mass concentration of O is 15-17%) is 2.1-2.5 tons, 3.2-3.5 tons of water washing liquid waste water and 310-330 Kg of hydrogen peroxide are pumped in, the tail gas generated during the production of the neutralized sulfuric acid can be treated by 2.5 multiplied by 10 every day 5 ～3×10 5 m 3 Sulfuric acid tail gas, the chemical composition of the tail gas is as follows: SO (SO) 2 The content of (C) is 500-1000 mg/m 3 Sulfuric acid mist H 2 SO 4 The content is 6-9mg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Sulfuric acid tail gas SO after spraying 2 The content of (C) is less than 20mg/m 3 。
In the step (5), when the evaporation concentration is carried out, saturated steam with the pressure of 4kg is needed, the concentration of the ammonium sulfate is concentrated from 260g/L to 290g/L to 450g/L to 550g/L, and the concentration is 1m each time 3 And (3) the ammonium sulfate solution needs 500kg of saturated steam, is pumped into a crystallization tank, is centrifuged when the temperature reaches 30-40 ℃, and is dried on a fluidized bed at 110-120 ℃ for 2-3 hours to obtain the ammonium sulfate finished product.
The tail gas generated when the sulfuric acid production is sprayed by adopting the solution in the circulating water tank, and the following chemical reaction occurs during spraying: 2NH 3 ·H 2 O+H 2 SO 4 ＝(NH4) 2 SO 4 +2H 2 O; in order to completely prevent the disqualification of the exhaust gas, the ammonia water is required to be excessive, but the ammonia water is not wasted, so that the reaction is circulated, namely, the solution generated by spraying is pumped back to the circulating water tank again, and the circulation is performed, so that the concentration of the ammonium sulfate is improved.
The ammonium sulfate prepared in the step (5) can be directly packaged and sold to compound fertilizer production enterprises.
And (5) returning condensed water generated during evaporation and concentration in the step (5) to a catalyst titanium dioxide production system for pulping the meta-titanic acid.
Compared with the prior art, the invention has the following beneficial effects:
(1) The novel process for preparing ammonium sulfate by recycling the catalyst titanium dioxide water washing liquid in the acid-making tail gas system uses the water washing liquid wastewater generated in the production of the catalyst titanium dioxide as tail gas spray in the production of sulfuric acid, thereby solving the treatment problem of low-concentration ammonium sulfate solution and saving spray water in the production of sulfuric acid.
(2) The novel process for preparing the ammonium sulfate by recycling the catalyst titanium dioxide water washing liquid in the acid-making tail gas system uses the water washing liquid wastewater generated in the production of the catalyst titanium dioxide as tail gas spray for sulfuric acid production, and uses the tail gas heat to perform preliminary concentration on the low-concentration ammonium sulfate solution, thereby saving energy.
(3) The catalyst titanium dioxide water washing liquid is recycled to a new process for preparing ammonium sulfate by an acid-making tail gas system, and the water washing liquid wastewater generated in the production of the catalyst titanium dioxide contains excessive ammonia water added during neutralization and is used as tail gas spray in the production of sulfuric acid, so that the consumption of spraying ammonia water is saved.
(4) The catalyst titanium dioxide water washing liquid is recycled to the novel process for preparing ammonium sulfate by the acid making tail gas system, and the water washing liquid wastewater is filtered again, so that the filtered meta-titanic acid is recovered, and the yield of the catalyst titanium dioxide production is improved.
(5) The catalyst titanium dioxide water washing liquid is recycled to a new process for preparing ammonium sulfate by an acid-making tail gas system, condensed water generated during multi-effect concentration of the ammonium sulfate is recycled to be used as beating water for producing the catalyst titanium dioxide, so that the consumption of deionized water is saved, and the whole production process has no external drainage.
Drawings
FIG. 1 is a process flow diagram of the catalyst titanium dioxide water washing liquid of the invention which is reused in an acid making tail gas system to prepare ammonium sulfate.
Detailed Description
The invention is further described below with reference to examples.
Example 1
The novel process for preparing ammonium sulfate by recycling the catalyst titanium dioxide washing liquid in the acid making tail gas system in the embodiment 1 comprises the following steps:
(1) Adding excessive ammonia water into the meta-titanic acid slurry, regulating the pH value of the system to 11, filtering, and washing a filter cake to obtain washing liquid wastewater and the filter cake;
(2) Filtering the water-washing wastewater obtained in the step (1) again to obtain water-washing filtrate and water-washing filter residues;
(3) Sending the filter cake obtained in the step (1) and the water washing filter residue obtained in the step (2) into a rotary kiln low-temperature calcination system for calcination to obtain catalyst titanium dioxide;
(4) Pumping the water washing filtrate obtained in the step (2) into a circulating water tank through a circulating water pump, adding ammonia water into the circulating water tank, and spraying tail gas generated during sulfuric acid production;
(5) When the concentration of ammonium sulfate in the circulating water tank in the step (4) reaches 275g/L, pumping the liquid in the circulating water tank into a concentration system for evaporation concentration, and then drying to obtain the ammonium sulfate.
Wherein:
the meta-titanic acid slurry in the step (1) is converted into TiO 2 The content is 300g/L, H 2 SO 4 The content of (C) is 20g/L.
The concentration of ammonia water in the step (1) is 16%.
The filtration accuracy of the filter element used in the filtration in the step (1) was 0.2. Mu.m.
And (2) filtering in the step (1), and washing a filter cake simultaneously, wherein the filter cake is meta-titanic acid, so as to obtain water-washing liquid wastewater, the water-washing liquid wastewater consists of a filtrate obtained by filtering and a waste liquid obtained by washing the filter cake simultaneously, and the filtrate obtained by filtering is: simultaneously, washing the filter cake with water to obtain waste liquid with the mass ratio of 1:2.5; and (3) washing the meta-titanic acid, wherein 4.5 tons of deionized water is needed to wash the filter cake per 1 ton of catalyst titanium dioxide to remove ammonium sulfate in the filter cake.
The concentration of ammonium sulfate in the water washing wastewater in the step (1) is 8g/L, and the concentration of ammonia water is 35mg/L.
And (3) filtering the washing water wastewater again in the step (2) in a plate-and-frame filtering mode, wherein the filter cloth is alkali-resistant filter cloth, and the filtering precision of the adopted filtering element is 0.2 mu m.
The filter residue of the water washing liquid obtained in the step (2) is catalyst titanium dioxide water washing penetrating filtered large particles of meta-titanic acid, the components of the filtrate of the water washing liquid are unchanged and the components of the wastewater of the water washing liquid are the same as those of the wastewater of the water washing liquid in the step (1), namely, the concentration of ammonium sulfate is 8g/L, and the concentration of ammonia water is 35mg/L.
The filter cake obtained in the step (1) and the filter residue of the water washing liquid obtained in the step (2) are sent into a rotary kiln low-temperature calcination system for calcination, and the primary ring temperature of the rotary kiln is 150 ℃; the second ring temperature was 300 ℃, the third ring temperature was 500 ℃, and the time required for the meta-titanic acid to enter the rotary kiln until the calcination was completed was 6.3 hours.
In the step (4), ammonia water (NH) is added into the circulating water tank every 24 hours 3 ·H 2 The mass concentration of O is 16%) of 2.1 tons, 3.2 tons of water washing liquid wastewater and 310Kg of hydrogen peroxide are pumped in to neutralize the tail gas generated during the sulfuric acid production, and the sulfuric acid tail gas is treated every day by 2.6X10 5 m 3 The chemical composition of the tail gas is as follows: SO (SO) 2 The content of (C) is 500-1000 mg/m 3 Sulfuric acid mist H 2 S0 4 The content is 6-9mg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Sulfuric acid tail gas SO after spraying 2 The content of (C) is less than 20mg/m 3 。
In the step (5), saturated steam with the pressure of 4kg is needed for evaporation concentration, the concentration of ammonium sulfate is concentrated from 275g/L to 500g/L, and then the concentrated solution is pumped into a crystallization tank, and when the temperature reaches 35 ℃, the concentrated solution is fedCentrifuging, drying the centrifuged ammonium sulfate crystal on a fluidized bed at 115 ℃ for 2.5 hours to obtain an ammonium sulfate finished product, wherein 4kg of saturated steam is consumed for 4t for producing one ton of ammonium sulfate, and the obtained ammonium sulfate detection result comprises the following nitrogen content (based on dry basis): 21.05%, moisture: 0.09%, free acid (H) 2 SO 4 ): undetected TiO 2 :0.0028%, water insoluble content: 0.009%, iron (Fe) content: 0.039%.
Example 2
The novel process for preparing ammonium sulfate by recycling the catalyst titanium dioxide washing liquid in the acid making tail gas system in the embodiment 2 comprises the following steps:
(1) Adding excessive ammonia water into the metatitanic acid slurry, regulating the pH value of the system to 10.5, filtering, and washing the filter cake to obtain washing liquid wastewater and the filter cake;
(2) Filtering the water-washing wastewater obtained in the step (1) again to obtain water-washing filtrate and water-washing filter residues;
(3) Sending the filter cake obtained in the step (1) and the water washing filter residue obtained in the step (2) into a rotary kiln low-temperature calcination system for calcination to obtain catalyst titanium dioxide;
(4) Pumping the water washing filtrate obtained in the step (2) into a circulating water tank through a circulating water pump, adding ammonia water into the circulating water tank, and spraying tail gas generated during sulfuric acid production;
(5) When the concentration of ammonium sulfate in the circulating water tank in the step (4) reaches 260g/L, pumping the liquid in the circulating water tank into a concentration system for evaporation concentration, and then drying to obtain the ammonium sulfate.
Wherein:
the meta-titanic acid slurry in the step (1) is converted into TiO 2 The content is 296g/L, H 2 SO 4 The content of (C) is 18g/L.
The concentration of ammonia in step (1) was 16.8%.
The filtration accuracy of the filter element used in the filtration in the step (1) was 0.3. Mu.m.
And (2) filtering in the step (1), and washing a filter cake simultaneously, wherein the filter cake is meta-titanic acid, so as to obtain water-washing liquid wastewater, the water-washing liquid wastewater consists of a filtrate obtained by filtering and a waste liquid obtained by washing the filter cake simultaneously, and the filtrate obtained by filtering is: simultaneously, washing the filter cake with water to obtain waste liquid with the mass ratio of 1:2; and (3) washing the meta-titanic acid, wherein 4 tons of deionized water is needed to wash the filter cake to remove ammonium sulfate in the filter cake per 1 ton of catalyst titanium dioxide.
The concentration of ammonium sulfate in the water washing wastewater in the step (1) is 6g/L, and the concentration of ammonia water is 30mg/L.
And (3) filtering the washing water wastewater again in the step (2) in a plate-and-frame filtering mode, wherein the filter cloth is alkali-resistant filter cloth, and the filtering precision of the adopted filtering element is 0.3 mu m.
The filter residue of the water washing liquid obtained in the step (2) is catalyst titanium dioxide water washing penetrating filtered large particles of meta-titanic acid, the components of the filtrate of the water washing liquid are unchanged and the components of the wastewater of the water washing liquid are the same as those of the wastewater of the water washing liquid in the step (1), namely, the concentration of ammonium sulfate is 6g/L, and the concentration of ammonia water is 30mg/L.
The filter cake obtained in the step (1) and the filter residue of the water washing liquid obtained in the step (2) are sent into a rotary kiln low-temperature calcination system for calcination, and the primary ring temperature of the rotary kiln is 130 ℃; the two-ring temperature was 250 ℃, the three-ring temperature was 450 ℃, and the time required for the meta-titanic acid to enter the rotary kiln until the calcination was completed was 6.5 hours.
In the step (4), ammonia water (NH) is added into the circulating water tank every 24 hours 3 ·H 2 The mass concentration of O is 16.8 percent) of 2.3 tons, 3.4 tons of water washing liquid wastewater and 330Kg of hydrogen peroxide are pumped in to neutralize the tail gas generated during the sulfuric acid production, and the sulfuric acid tail gas is treated every day by 2.8X10 5 m 3 The chemical composition of the tail gas is as follows: SO (SO) 2 The content of (C) is 500-1000 mg/m 3 Sulfuric acid mist H 2 S0 4 The content is 6-9mg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Sulfuric acid tail gas SO after spraying 2 The content of (C) is less than 20mg/m 3 。
In the step (5), when the evaporation concentration is carried out, saturated steam with the pressure of 4kg is needed, the concentration of ammonium sulfate is concentrated from 260g/L to 450g/L, then the concentrated ammonium sulfate is pumped into a crystallization tank, and when the temperature reaches 30 ℃, the centrifugation is carried out, and the sulfur after the centrifugationDrying the ammonium sulfate crystal on a fluidized bed at 110 ℃ for 3 hours to obtain an ammonium sulfate finished product, wherein 4kg of saturated steam is consumed for producing one ton of ammonium sulfate for 3.9t, and the obtained ammonium sulfate detection result shows that the nitrogen content (based on dry basis): 21.03%, moisture: 0.08%, free acid (H) 2 SO 4 ): undetected TiO 2 0.0023% of water insoluble matter content: 0.009%, iron (Fe) content: 0.032%.
Example 3
The novel process for preparing ammonium sulfate by recycling the catalyst titanium dioxide washing liquid in the acid making tail gas system in embodiment 3 comprises the following steps:
(1) Adding excessive ammonia water into the meta-titanic acid slurry, regulating the pH value of the system to 11.5, filtering, and washing a filter cake to obtain washing liquid wastewater and the filter cake;
(2) Filtering the water-washing wastewater obtained in the step (1) again to obtain water-washing filtrate and water-washing filter residues;
(3) Sending the filter cake obtained in the step (1) and the water washing filter residue obtained in the step (2) into a rotary kiln low-temperature calcination system for calcination to obtain catalyst titanium dioxide;
(4) Pumping the water washing filtrate obtained in the step (2) into a circulating water tank through a circulating water pump, adding ammonia water into the circulating water tank, and spraying tail gas generated during sulfuric acid production;
(5) When the concentration of ammonium sulfate in the circulating water tank in the step (4) reaches 290g/L, pumping the liquid in the circulating water tank into a concentration system for evaporation concentration, and then drying to obtain the ammonium sulfate.
Wherein:
the meta-titanic acid slurry in the step (1) is converted into TiO 2 The content is 320g/L, H 2 SO 4 The content of (C) was 22g/L.
The concentration of ammonia water in the step (1) is 17%.
The filtration accuracy of the filter element used in the filtration in the step (1) was 0.1. Mu.m.
And (2) filtering in the step (1), and washing a filter cake simultaneously, wherein the filter cake is meta-titanic acid, so as to obtain water-washing liquid wastewater, the water-washing liquid wastewater consists of a filtrate obtained by filtering and a waste liquid obtained by washing the filter cake simultaneously, and the filtrate obtained by filtering is: simultaneously, washing the filter cake with water to obtain waste liquid with the mass ratio of 1:3; and (3) washing the meta-titanic acid, wherein 5 tons of deionized water is needed to wash the filter cake per 1 ton of catalyst titanium dioxide to remove ammonium sulfate in the filter cake.
The concentration of ammonium sulfate in the water washing wastewater in the step (1) is 10g/L, and the concentration of ammonia water is 40mg/L.
And (3) filtering the washing water wastewater again in the step (2) in a plate-and-frame filtering mode, wherein the filter cloth is alkali-resistant filter cloth, and the filtering precision of the adopted filtering element is 0.1 mu m.
The filter residue of the water washing liquid obtained in the step (2) is catalyst titanium dioxide water washing penetrating filtered large particles of meta-titanic acid, the components of the filtrate of the water washing liquid are unchanged and the components of the wastewater of the water washing liquid are the same as those of the wastewater of the water washing liquid in the step (1), namely, the concentration of ammonium sulfate is 10g/L, and the concentration of ammonia water is 40mg/L.
The filter cake obtained in the step (1) and the filter residue of the water washing liquid obtained in the step (2) are sent into a rotary kiln low-temperature calcination system for calcination, and the primary ring temperature of the rotary kiln is 180 ℃; the two-ring temperature is 350 ℃, the three-ring temperature is 550 ℃, and the time from entering the rotary kiln to the completion of calcination of the metatitanic acid is 6 hours.
In the step (4), ammonia water (NH) is added into the circulating water tank every 24 hours 3 ·H 2 The mass concentration of O is 17%) 2.5 tons, 3.5 tons of water washing liquid wastewater and 330Kg of hydrogen peroxide are pumped in to neutralize the tail gas generated during the sulfuric acid production, and the sulfuric acid tail gas is treated for 3.0 multiplied by 10 every day 5 m 3 The chemical composition of the tail gas is as follows: SO (SO) 2 The content of (C) is 500-1000 mg/m 3 Sulfuric acid mist H 2 S0 4 The content is 6-9mg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Sulfuric acid tail gas SO after spraying 2 The content of (C) is less than 20mg/m 3 。
In the step (5), when evaporating and concentrating, saturated steam with the pressure of 4kg is needed, the concentration of ammonium sulfate is concentrated from 290g/L to 550g/L, then the concentrated solution is pumped into a crystallization tank, when the temperature reaches 40 ℃, the centrifugalization is carried out, the centrifugalized ammonium sulfate crystals are dried on a fluidized bed,the drying temperature is 120 ℃, the drying time is 2 hours, the finished product of ammonium sulfate is obtained, 4kg of saturated steam is consumed for producing one ton of ammonium sulfate for 4.1t, and the obtained ammonium sulfate detection result shows that the nitrogen content (based on dry basis): 21.06%, moisture: 0.08%, free acid (H) 2 SO 4 ): undetected TiO 2 0.0026% of water insoluble matter content: 0.009%, iron (Fe) content: 0.042%.
Comparative example 1
The novel process for preparing ammonium sulfate by recycling the catalyst titanium dioxide washing liquid in comparative example 1 to an acid making tail gas system comprises the following steps:
(1) Adding excessive ammonia water into the meta-titanic acid slurry, regulating the pH value of the system to 11, filtering, and washing a filter cake to obtain washing liquid wastewater and the filter cake;
(2) Filtering the water-washing wastewater obtained in the step (1) again to obtain water-washing filtrate and water-washing filter residues;
(3) Sending the filter cake obtained in the step (1) and the water washing filter residue obtained in the step (2) into a rotary kiln low-temperature calcination system for calcination to obtain catalyst titanium dioxide;
(4) Pumping the water washing filtrate obtained in the step (2) into a concentration system by a water pump for evaporation concentration, and then drying to obtain the ammonium sulfate.
Wherein:
the meta-titanic acid slurry in the step (1) is converted into TiO 2 The content is 300g/L, H 2 SO 4 The content of (C) is 20g/L.
The concentration of ammonia water in the step (1) is 16%.
The filtration accuracy of the filter element used in the filtration in the step (1) was 0.2. Mu.m.
And (2) filtering in the step (1), and washing a filter cake simultaneously, wherein the filter cake is meta-titanic acid, so as to obtain water-washing liquid wastewater, the water-washing liquid wastewater consists of a filtrate obtained by filtering and a waste liquid obtained by washing the filter cake simultaneously, and the filtrate obtained by filtering is: simultaneously, washing the filter cake with water to obtain waste liquid with the mass ratio of 1:2.5; and (3) washing the meta-titanic acid, wherein 4.5 tons of deionized water is needed to wash the filter cake per 1 ton of catalyst titanium dioxide to remove ammonium sulfate in the filter cake.
The concentration of ammonium sulfate in the water washing wastewater in the step (1) is 8g/L, and the concentration of ammonia water is 35mg/L.
And (3) filtering the washing water wastewater again in the step (2) in a plate-and-frame filtering mode, wherein the filter cloth is alkali-resistant filter cloth, and the filtering precision of the adopted filtering element is 0.2 mu m.
The filter residue of the water washing liquid obtained in the step (2) is catalyst titanium dioxide water washing penetrating filtered large particles of meta-titanic acid, the components of the filtrate of the water washing liquid are unchanged and the components of the wastewater of the water washing liquid are the same as those of the wastewater of the water washing liquid in the step (1), namely, the concentration of ammonium sulfate is 8g/L, and the concentration of ammonia water is 35mg/L.
The filter cake obtained in the step (1) and the filter residue of the water washing liquid obtained in the step (2) are sent into a rotary kiln low-temperature calcination system for calcination, and the primary ring temperature of the rotary kiln is 150 ℃; the second ring temperature was 300 ℃, the third ring temperature was 500 ℃, and the time required for the meta-titanic acid to enter the rotary kiln until the calcination was completed was 6.3 hours.
In the step (4), when evaporation concentration is carried out, saturated steam with the pressure of 4kg is needed, the concentration of ammonium sulfate is concentrated from 8g/L to 500g/L, then the concentrated solution is pumped into a crystallization tank, when the temperature reaches 35 ℃, the centrifuged solution is centrifuged, the centrifuged ammonium sulfate crystals are dried on a fluidized bed, the drying temperature is 115 ℃, the drying time is 2.5 hours, the finished product of ammonium sulfate is obtained, 4kg of saturated steam is consumed for producing one ton of ammonium sulfate, 62.5t of the obtained ammonium sulfate detection result is obtained, and the nitrogen content (based on dry basis): 20.04%, moisture: 0.08%, free acid (H) 2 SO 4 ): undetected TiO 2 0.0029% of water insoluble matter content: 0.009%, iron (Fe) content: 0.008%.
Comparative example 2
The novel process for preparing ammonium sulfate by recycling the catalyst titanium dioxide washing liquid in comparative example 2 to an acid making tail gas system comprises the following steps:
(1) Adding excessive ammonia water into the meta-titanic acid slurry, regulating the pH value of the system to 11.5, filtering, and washing a filter cake to obtain washing liquid wastewater and the filter cake;
(2) Preparing the filter cake obtained in the step (1) to obtain catalyst titanium dioxide;
(3) Pumping the water washing filtrate obtained in the step (1) into a circulating water tank through a circulating water pump, adding ammonia water into the circulating water tank, and spraying tail gas generated during sulfuric acid production;
(4) When the concentration of ammonium sulfate in the circulating water tank in the step (3) reaches 290g/L, pumping the liquid in the circulating water tank into a concentration system for evaporation concentration, and then drying to obtain the ammonium sulfate.
Wherein:
the meta-titanic acid slurry in the step (1) is converted into TiO 2 The content is 320g/L, H 2 SO 4 The content of (C) was 22g/L.
The concentration of ammonia water in the step (1) is 17%.
The filtration accuracy of the filter element used in the filtration in the step (1) was 0.1. Mu.m.
And (2) filtering in the step (1), and washing a filter cake simultaneously, wherein the filter cake is meta-titanic acid, so as to obtain water-washing liquid wastewater, the water-washing liquid wastewater consists of a filtrate obtained by filtering and a waste liquid obtained by washing the filter cake simultaneously, and the filtrate obtained by filtering is: simultaneously, washing the filter cake with water to obtain waste liquid with the mass ratio of 1:3; and (3) washing the meta-titanic acid, wherein 5 tons of deionized water is needed to wash the filter cake per 1 ton of catalyst titanium dioxide to remove ammonium sulfate in the filter cake.
The concentration of ammonium sulfate in the water washing wastewater in the step (1) is 10g/L, and the concentration of ammonia water is 40mg/L.
In the step (2), the filter cake obtained in the step (1) is sent into a rotary kiln low-temperature calcination system for calcination to prepare catalyst titanium dioxide, and the primary ring temperature of the rotary kiln is 180 ℃; the two-ring temperature is 350 ℃, the three-ring temperature is 550 ℃, and the time from entering the rotary kiln to the completion of calcination of the metatitanic acid is 6 hours.
In the step (3), ammonia water (NH) is added into the circulating water tank every 24 hours 3 ·H 2 The mass concentration of O is 17 percent) of 2.5 tons, 3.5 tons of water washing liquid wastewater and 330Kg of hydrogen peroxide are pumped in to neutralize the tail gas generated during the production of sulfuric acidTreating sulfuric acid tail gas 3.0X10 a day 5 m 3 The chemical composition of the tail gas is as follows: SO (SO) 2 The content of (C) is 500-1000 mg/m 3 Sulfuric acid mist H 2 S0 4 The content is 6-9mg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Sulfuric acid tail gas SO after spraying 2 The content of (C) is less than 20mg/m 3 。
In the step (4), when evaporation concentration is carried out, saturated steam with the pressure of 4kg is needed, the concentration of ammonium sulfate is concentrated from 290g/L to 550g/L, then the concentrated solution is pumped into a crystallization tank, when the temperature reaches 40 ℃, the centrifuged solution is centrifuged, the centrifuged ammonium sulfate crystals are dried on a fluidized bed, the drying temperature is 120 ℃, the drying time is 2 hours, the finished product of ammonium sulfate is obtained, 4kg of saturated steam is consumed for producing one ton of ammonium sulfate, 4.1t of the obtained ammonium sulfate detection result is obtained, and the nitrogen content (based on dry basis): 20.02%, moisture: 0.09%, free acid (H) 2 SO 4 ): undetected TiO 2 0.038 percent, water insoluble matter content: 0.045%, iron (Fe) content: 0.052%.
Claims (4)
1. A novel process for preparing ammonium sulfate by recycling catalyst titanium dioxide washing liquid to an acid-making tail gas system is characterized by comprising the following steps of: the method comprises the following steps:
(1) Adding excessive ammonia water into the metatitanic acid slurry, regulating the pH value of the system to 10.5-11.5, filtering, and washing the filter cake to obtain washing liquid wastewater and the filter cake;
(2) Filtering the water-washing wastewater obtained in the step (1) again to obtain water-washing filtrate and water-washing filter residues;
(3) Sending the filter cake obtained in the step (1) and the water washing filter residue obtained in the step (2) into a rotary kiln low-temperature calcination system for calcination to obtain catalyst titanium dioxide;
(4) Pumping the water washing filtrate obtained in the step (2) into a circulating water tank through a circulating water pump, adding ammonia water into the circulating water tank, and spraying tail gas generated during sulfuric acid production;
(5) When the concentration of ammonium sulfate in the circulating water tank in the step (4) reaches 260 g/L-290 g/L, pumping the liquid in the circulating water tank into a concentration system for evaporation concentration, and then drying to prepare ammonium sulfate;
wherein:
the meta-titanic acid slurry in the step (1) is converted into TiO 2 The content is 280-320 g/L, H 2 SO 4 The content of (2) is 18-22 g/L; the concentration of the ammonia water in the step (1) is 15% -17%; the filtering precision of the filtering element adopted in the step (1) is 0.1 mu m-0.3 mu m;
and (2) filtering in the step (1), and washing a filter cake simultaneously, wherein the filter cake is meta-titanic acid, so as to obtain water-washing liquid wastewater, the water-washing liquid wastewater consists of a filtrate obtained by filtering and a waste liquid obtained by washing the filter cake simultaneously, and the filtrate obtained by filtering is: simultaneously, washing the filter cake with water to obtain waste liquid with the mass ratio of 1:2-3;
the concentration of ammonium sulfate in the water washing liquid wastewater in the step (1) is 6-10 g/L, and the concentration of ammonia water is 30-40 mg/L;
2.1 to 2.5 tons of ammonia water is added into the circulating water tank every 24 hours in the step (4), the mass concentration of the ammonia water is 15 to 17 percent, 3.2 to 3.5 tons of water washing liquid wastewater and 310 to 330Kg of hydrogen peroxide are pumped in, and the tail gas generated during the production of the sulfuric acid is neutralized, so that the tail gas can be treated for 2.5X10 per day 5 ～3×10 5 m 3 Sulfuric acid tail gas, the chemical composition of the tail gas is as follows: SO (SO) 2 The content of (C) is 500-1000 mg/m 3 Sulfuric acid mist H 2 SO 4 The content is 6-9mg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Sulfuric acid tail gas SO after spraying 2 Is less than 20mg/m 3 ；
In the step (5), when the evaporation concentration is carried out, saturated steam with the pressure of 4kg is needed, the concentration of the ammonium sulfate is concentrated from 260g/L to 290g/L and g/L to 450g/L to 550g/L, and the concentration is 1m each time 3 And (3) the ammonium sulfate solution needs 500kg of saturated steam, is pumped into a crystallization tank, is centrifuged when the temperature reaches 30-40 ℃, and is dried on a fluidized bed at 110-120 ℃ for 2-3 hours to obtain the ammonium sulfate finished product.
2. The novel process for preparing ammonium sulfate by recycling the catalyst titanium dioxide washing liquid in an acid making tail gas system according to claim 1, which is characterized in that: and (3) filtering the reclaimed water washing wastewater again in the step (2), wherein the filtering mode is plate-frame filtering, the filter cloth is alkali-resistant filter cloth, and the filtering precision of the adopted filtering element is 0.1 mu m-0.3 mu m.
3. The novel process for preparing ammonium sulfate by recycling the catalyst titanium dioxide washing liquid in an acid making tail gas system according to claim 1, which is characterized in that: the filter residue of the water washing liquid obtained in the step (2) is catalyst titanium dioxide water washing penetrating filtered large particles of meta-titanic acid, the components of the filtrate of the water washing liquid are unchanged and are the same as those of the wastewater of the water washing liquid in the step (1), namely, the concentration of ammonium sulfate is 6-10 g/L, and the concentration of ammonia water is 30-40 mg/L.
4. The novel process for preparing ammonium sulfate by recycling the catalyst titanium dioxide washing liquid in an acid making tail gas system according to claim 1, which is characterized in that: the filter cake obtained in the step (1) and the filter residue of the water washing liquid obtained in the step (2) are sent into a rotary kiln low-temperature calcination system for calcination, and the primary ring temperature of the rotary kiln is 130-180 ℃; the temperature of the two rings is 250-350 ℃, the temperature of the three rings is 450-550 ℃, and the time from the feeding of the metatitanic acid into the rotary kiln to the completion of calcination is 6-6.5 hours.
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Denomination of invention: New process for preparing ammonium sulfate by recycling the washing solution of titanium white powder catalyst into the acid production tail gas system Granted publication date: 20240220 Pledgee: Industrial and Commercial Bank of China Limited Zibo Boshan sub branch Pledgor: SHANDONG DOGUIDE GROUP Co.,Ltd. Registration number: Y2025980044998 |